ニオブとタンタルの液液抽出における鉄の挙動について

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タイトル別名
  • Behavior of Fe in Liquid-Liquid Extraction of Nb and Ta
  • ニオブ ト タンタル ノ エキエキ チュウシュツ ニ オケル テツ ノ キョドウ ニ ツイテ

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The behaviors of Sn and Ti in liquid-liquid solvent extraction of Nb and Ta were already reported. In this report, the behavior of Fe in liquid-liquid solvent extraction of Nb and Ta by using a organic solvent, hexone, was studied in the four systems, HF-HNO3-hexone, HF-HCl-hexone, HF-H2SO4-hexone, and HF-hexone in which seven organic solvents besides hexone were used. The results obtained can be summarized as follows: (1) By measuring the individual distribution coefficients of Fe, Ta and Nb in the extractive systems, it was found that Fe can be separated sufficiently from Nb and Ta. (2) The extractability of Fe increases with an increase of mineral acid concentration in a constant HF acidity and rapidly increases from 2.24N HCl in HF-HCl-hexone system and from 10.6N H2SO4 in HF-H2SO4-hexone system, but more gradually with increasing HNO3 concentration or HF concentration in HF-HNO3-hexone system and HF-hexone system. (3) In the constant high HF acidity, 12.75N, the extractivity of Fe decreases, as in the case of the behaviors of Sn and Ti in the following order: HF-HCl system>HF-H2SO4 system>HF-HNO3 system. Therefore, HF-HNO3-hexone system is the best system in respect of the purity of the organic extract. (4) HF-hexone system is generally less extractable of Fe than other HF-mineral acid-hexone systems, but HF-H2SO4 below 1.5N H2SO4 and HF-HNO3 below 4.2N HNO3, in which HF acidity is 12.75N have less extractability of Fe than 12.75N HF hexone system and have, more over, larger coextraction efficiency of Nb and Ta than HF-hexone system. (5) Judging from Fe distribution coefficient in HF-hexone system, good organic solvents are tributyl phosphate, octyl alcohol, isoamyl alcohl, methyl isobutyl ketone, and mesityl oxide while poor solvents are butyl alcohol, ethyl acetoacetate, and methyl ethyl ketone. In both alcohol and ketone groups, the extraction efficiency of organic extract and Fe distribution coefficient decrease with an increase of molecular weight of organic solvent, and a decrease of dielectric constant. By comparing mesityl oxide with methyl isobutyl ketone it might be said that the presence of double bond structure causes the increase of Fe distribution coefficients and of extraction efficiency of organic extract.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 25 (2), 112-116, 1961

    公益社団法人 日本金属学会

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